Quick answer: Protection may limit current, shut down or require a reset. Output capacitance can release stored energy before the control loop responds, so short-circuit protection is not permission to short the terminals or touch the output.
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Protection response differs by model
A short can invoke constant-current limiting, foldback, latched shutdown or another documented behaviour. The instrument may require a reset after the cause is removed. Do not infer the response from an OCP label or from a different model’s manual.
Current limiting does not remove stored energy
Output and load capacitance can release energy before a control loop responds. Stored capacitor energy is E = ½CV²; increasing voltage increases stored energy quadratically for the same capacitance. This is one reason high-voltage fixture design cannot rely on a current limit alone.
Design the connection for fault conditions
Consider voltage rating, insulation, current capability and expected fault energy for cables and connectors. Follow the documented discharge procedure and prevent access to hazardous outputs. Do not deliberately short terminals as a generic demonstration of protection.
After a protection event
- Disable output and follow the prescribed discharge process.
- Identify load demand, external wiring and the reported fault safely.
- Remove the cause before following the model-specific reset sequence.
- Escalate persistent or unexplained faults to qualified service.
Practical checks
| Check | What to verify |
|---|---|
| Response | Read the documented current-limit and shutdown behaviour. |
| Stored energy | Account for supply and load capacitance. |
| Connection | Use ratings appropriate for voltage, current and fault energy. |
| Reset | Remove the cause with output disabled and follow the manual. |
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